switch to tell which templates are instanciated

[Julien D Arques via Gcc-help <gcc-help@xxxxxxxxxxx>]

Hi,
is there a switch telling you which templates have been instanciated during
compilation?
and if one template have not been instanciated at all?

The workaround is to have overloads in my header -> source code instead to
force instanciation but that's just a question here.

Thanks